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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 510,806 | $ 808,870
Securities available-for-sale, less than 12 months, unrealized losses | (54,261) | (12,206)
Securities available-for-sale, 12 months or more, fair value | 597,455 | 103,568
Securities available-for-sale, 12 months or more, unrealized losses | (114,102) | (3,156)
Securities available-for-sale, fair value | 1,108,261 | 912,438
Securities available-for-sale, unrealized losses | (168,363) | (15,362)
Securities HTM, less than 12 months, fair value | 431,575 |
Securities HTM, less than 12 months, unrealized losses | (44,756) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 431,575 |
Securities HTM, unrealized losses | (44,756) |
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 21,554 | 122,501
Securities available-for-sale, less than 12 months, unrealized losses | (1,391) | (1,252)
Securities available-for-sale, 12 months or more, fair value | 92,872 | 0
Securities available-for-sale, 12 months or more, unrealized losses | (6,988) | 0
Securities available-for-sale, fair value | 114,426 | 122,501
Securities available-for-sale, unrealized losses | (8,379) | (1,252)
Securities HTM, less than 12 months, fair value | 208,011 |
Securities HTM, less than 12 months, unrealized losses | (9,673) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 208,011 |
Securities HTM, unrealized losses | (9,673) |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 96,995 | 23,789
Securities available-for-sale, less than 12 months, unrealized losses | (4,999) | (223)
Securities available-for-sale, 12 months or more, fair value | 16,589 | 447
Securities available-for-sale, 12 months or more, unrealized losses | (1,670) | (13)
Securities available-for-sale, fair value | 113,584 | 24,236
Securities available-for-sale, unrealized losses | (6,669) | (236)
Securities HTM, less than 12 months, fair value | 23,374 |
Securities HTM, less than 12 months, unrealized losses | (2,498) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 23,374 |
Securities HTM, unrealized losses | (2,498) |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 288,778 | 615,130
Securities available-for-sale, less than 12 months, unrealized losses | (33,664) | (10,027)
Securities available-for-sale, 12 months or more, fair value | 461,306 | 102,637
Securities available-for-sale, 12 months or more, unrealized losses | (99,135) | (3,127)
Securities available-for-sale, fair value | 750,084 | 717,767
Securities available-for-sale, unrealized losses | (132,799) | (13,154)
Securities HTM, less than 12 months, fair value | 200,190 |
Securities HTM, less than 12 months, unrealized losses | (32,585) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 200,190 |
Securities HTM, unrealized losses | (32,585) |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 98,599 | 46,493
Securities available-for-sale, less than 12 months, unrealized losses | (14,002) | (686)
Securities available-for-sale, 12 months or more, fair value | 25,924 | 484
Securities available-for-sale, 12 months or more, unrealized losses | (6,169) | (16)
Securities available-for-sale, fair value | 124,523 | 46,977
Securities available-for-sale, unrealized losses | (20,171) | (702)
Other Debt Obligations [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 4,880 | 957
Securities available-for-sale, less than 12 months, unrealized losses | (205) | (18)
Securities available-for-sale, 12 months or more, fair value | 764 | 0
Securities available-for-sale, 12 months or more, unrealized losses | (140) | 0
Securities available-for-sale, fair value | 5,644 | 957
Securities available-for-sale, unrealized losses | $ (345) | $ (18)

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